For service and parts needs, visit your dealer. You will receive genuine GM parts and GM-trained and supported service people.
Genuine GM parts have one of these marks:

Vehicle Care
California Proposition 65 WarningBrake Pedal Position Sensor Calibration
Calibration Criteria
Note: Do not apply the brake pedal during the brake pedal position
(BPP) sensor calibration procedure. Any movement of the brake pedal
during this procedure will cause the calibration procedure to fail. If this
occurs, the sensor calibration must be repeated.
Brake pedal ...
Stabilizer Shaft Replacement
Special Tools
CH 904 Underframe
CH 49289 Centering Adapter
EN 45059 Torque Angle Sensor Kit
For equivalent regional tools, refer to Special Tools.
Removal Procedure
Turn the front wheels to the straight forward position and secure the
steering wheel from moving.
...
Headlamp Aiming Procedure
Open the hood.
Measure from the floor to the center of the headlamp bulb. Some
headlamps have an aim dot marked on the headlamp lens.
At the screen, measure from the floor and place the horizontal tape at
the measured distance.
Measure from the reference line on the floor to the le ...